2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 149 



the collection has paleogeographic significance and raises important 

 questions concerning intercontinental correlations. 



During the summer of 1962, R. J. Ross, Jr., and L. R. Mayo col- 

 lected Cambrian, Ordovician, and Devonian fossils from the north 

 end of Jones Ridge along the valley of Hard Luck Creek, Alaska. 

 This work was done in support of a mapping program conducted by 

 Earl E. Brabb of the U.S. Geological Survey in the Charley River 

 quadrangle. The general area is north of the Tatonduk River, a 

 tributary of the Yukon, in sec. 9, 15, 16, T. 3 N., R. 33 E., Charley 

 River (A-l) quadrangle (fig. 1). This area was originally mapped 



142 



141' 



65* 



10 5 



Miles 



Fig. 1. — Index map, showing relative positions of brachiopod-bearing carbonate 

 rocks and graptolite-rich shales of Ordovician age. Charley River (A-l) 

 quadrangle outlined. 



